Introduction to large volume concrete thermometer

The large volume concrete thermometer was developed in cooperation between our company and Tianjin University of Science and Technology. The sensor used is an imported 18b20 sensor from the United States, which has high accuracy and stability.

In construction, large volume concrete refers to concrete with common characteristics: thick structure, large amount of concrete, complex engineering conditions, and high construction technology requirements. Due to the possibility of temperature deformation caused by cement hydration heat, corresponding technical measures must be taken to minimize cracking caused by temperature deformation as much as possible. As is well known, the problems that generally occur with large volume concrete are not mechanical structural issues, but rather cracks caused by temperature changes, which lead to a decrease in the impermeability, crack resistance, and erosion resistance of the concrete, affecting the durability of the entire structure.

In practical work, the temperature change process of large volume concrete can be divided into three stages: heating period, cooling period, and stable period. A large amount of experimental data shows that the temperature of concrete is in the rising stage 1-3 days after pouring, and the temperature inside the concrete mostly occurs within 3-5 days after pouring. After 5 days, the temperature of concrete is in the declining stage. Therefore, the temperature change of concrete should be closely observed within 1-5 days after pouring, with temperature measurement every 2-4 hours and every 6-8 hours after 5 days. At the same time, the atmospheric temperature should be measured until no measures are taken and the temperature difference between the inner and outer surfaces can be controlled within the required range of the specifications. In addition, when measuring the temperature at different depths and surfaces inside the concrete, all measuring points should be numbered, and the temperature measurement records should be promptly submitted to the technical director of the construction site for signature, so that corresponding measures can be taken in a timely manner to control the temperature changes of the concrete.

Key points for operating a large volume concrete thermometer:

1. Select appropriate temperature measuring wires according to the number and depth of temperature measurement points. The temperature measuring wires are pre embedded with steel bars as supports. First, tie the temperature measuring wires to the steel bars. The temperature sensing elements of the temperature measuring wires should be located at the temperature measuring points and should not be in direct contact with the steel bars.

2. Before pouring concrete, insert the steel bars with temperature measuring wires tied in place into the concrete, leave the plugs outside, and cover them with plastic bags to avoid moisture and keep them clean. For ease of operation, the length of the temperature measuring wires left outside should be greater than 20cm, and they should be tied in order of top, middle, and bottom.

3. When conducting wireless temperature measurement: Insert the temperature measurement cable plug left outside into the wireless collector socket, and the wireless thermometer host can display the temperature of each measuring point simultaneously. When conducting wired temperature measurement: Press the switch of the thermometer host, insert the plugs of each measuring point into the host socket in sequence, and the corresponding measuring point temperature will be displayed on the host screen.

4. Carefully record and analyze temperature measurement data, and promptly report the results to the commissioning unit.

Technical parameters of large volume concrete thermometer:

1. Temperature measurement range:- 50℃—120℃

2. Equipment working environment temperature:- 20℃—60℃

3. Temperature measurement points: 32 channels.

4. Sensor connection length: 50 meters

5. Power Supply: Terminal 220V/AC, Backup Power Wireless Host DC5V

6. Communication method: Local USB communication, original wireless LAN communication

7. Collection interval: 1-99 minutes

8. Test accuracy: 0.5 ℃

9. Wireless transmission distance: line of sight 1km-8km optional. (Usually 1km, other reservations)

Randomly give away 10 20 meter long temperature measuring wires, and temperature measuring wires within 200m can be customized.